Finding the Fourth Proportional to 1,308.57, 1,805.81 and 719.16

Step by Step Solution

1. Step 1: Write the proportion equation
   1,308.57 : 1,805.81 = 719.16 : x
2. Step 2: Convert to fraction form
   1,308.57/1,805.81 = 719.16/x
3. Step 3: Cross multiply
   1,308.57x = 1,805.81 × 719.16
4. Step 4: Simplify right side
   1,308.57x = 1,298,662.72
5. Step 5: Solve for x
   x = 1,298,662.72/1,308.57
6. Step 6: Final answer
   x = 992.43